Update CHANGELOG

CHANGELOG.md

@@ -1,3 +1,15 @@
+## [3.1.8](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.8)
+
+### Bug Fixes
+
+- Fix `Liquid Exception: undefined method 'gsub' for nil:NilClass in _layouts/single.html` error when `page.title` is null. `<h1>` element is now conditional if `title: ` is not set for a `page` or collection item. [#312](https://github.com/mmistakes/minimal-mistakes/issues/312)
+
+### Maintenance
+
+- Remove duplicate `fa-twitter` and `fa-twitter-square` classes from `_utilities.scss`. [#302](https://github.com/mmistakes/minimal-mistakes/issues/302)
+
+- Document installing additional Jekyll gem dependencies when using `gem "jekyll"` instead of `gem "github-pages"` to avoid any errors on run. [#305](https://github.com/mmistakes/minimal-mistakes/issues/305)
+
 ## [3.1.7](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.7)
 
 ### Enhancement
@@ -6,7 +18,7 @@
 
 ### Maintenance
 
-- Small fix to avoid underlying the whitespace between icons and related text when hovering.[#303](https://github.com/mmistakes/minimal-mistakes/pull/303)
+- Small fix to avoid underlying the whitespace between icons and related text when hovering. [#303](https://github.com/mmistakes/minimal-mistakes/pull/303)
 
 ## [3.1.6](https://github.com/mmistakes/minimal-mistakes/releases/tag/3.1.6)